/**
 *    Copyright 2009-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.aapl.script.creator;

import org.apache.ibatis.aapl.annotation.TableWatcher;
import org.apache.ibatis.aapl.util.*;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.LinkedList;
import java.util.List;

public class SelectOneSqlCreator implements SqlCreator {

  @Override
  public String createSql(String script, Method method, TableWatcher watcher) {
    Class<?> returnType = ReflectUtil.getMethodReturnType(method);
    if (returnType == null) {
      return script;
    }
    Clause parse = ClauseUtil.parse(script);
    List<String> excepts = parse.except();
    if (watcher == null || watcher.value().length() == 0) {
      return script;
    }
    StringBuilder builder = new StringBuilder();
    builder.append("select ");
    Field[] declaredFields = returnType.getDeclaredFields();
    List<Field> fields = new LinkedList<>();
    for (Field e : declaredFields) {
      if (!Modifier.isStatic(e.getModifiers()) && !excepts.contains(e.getName())) {
        fields.add(e);
      }
    }
    for (int i = 0; i < fields.size(); i++) {
      String name = fields.get(i).getName();
      builder.append(NameUtil.camel2Underline(name));
      if (i != fields.size() - 1) {
        builder.append(",");
      }
    }
    builder.append(" from ");
    builder.append(watcher.value());
    builder.append(" ");
    builder.append("where id = #{id} limit 1");
    return builder.toString();
  }
}
